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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d0870d02fc8b67b26d16559bf8ca2db4f7e1495d9c2b482f8b78a76b2f746c' 
  AND token = 'Y9VVjz3aCeGOxOrpLiau4AqntA6i9nvA/XoX9Ro1MzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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