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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd167f4ee392473d02aa6100589f0cb2944141cdea371ab2705735ce0c6afbfd6' 
  AND token = 'P3v2u8T37XREt5Nmi6SnD3zFp9wIEjRltPFnm7/QhjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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