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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9be097e8be5924c2f39f9f9b9d97643380daa2c849eeed289e22d345a4943e' 
  AND token = '/5SOwC7ogL5YAt08r3syU5dbqDKpxi+zJKAfMamcAYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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