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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81cf934503abb1ce89108dcd64cea21735fd1f744815e29fe1faa88af1da6826' 
  AND token = 'SV8OvL1QDgV9KID9ltyXRO3nMim2JBB3KZv8Sr21Opg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}