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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7624be87116f29c4c901fd2025bcfee46c6d41b15b02b791c94add90477bb171' 
  AND token = 'UB29YVNumLmPdlyFlREsnGC34cLTl2R3Mfj6A7v6jws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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