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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40c0da3a1c7a74937955cd6aaff5ac75bc078a812a1c412efd3ec98a2c3df15' 
  AND token = '3eXksonUArsXMXtl06KIo+XbYom6XoReNP9YBiKo+8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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