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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d130b219f0e60d6f511538535cde3d75e0657d333776d7681ca33c7fc8877f6' 
  AND token = '2wxJh4PoqML7QEsecp5/7bUJV6yy1hhfk7U7U27bgqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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