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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd01d25ecb40046862674332b7b1e6e23b4337424546cf2b79d3221e5a4eb58' 
  AND token = '93kX/TDsaAjzr0AZxhOWDHL3HakUr6Z4ty+hfP77ab4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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