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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7978742f8559e3951527960c2e93427bb0460c1acea15f4a4f637a2f882e032d' 
  AND token = 'yE37aab+A5QLh189Q4RSPl68NhPLiCNLmFd+rDuTUpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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