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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576997f0b89dbca552b2b6fd6730e0162e4b80d31e58619801d1d94660034ee9' 
  AND token = '5P2zEeUmNGekO9WQ75hdOoq3BTAaOtHZtV1VoKA36H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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