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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68615597dcdd8665e73b11c13d0036c6bfa0a14c9609ccadd3676c6299306e6' 
  AND token = 'tF/JThDvgAbCUJrKuAF2U9Q/T0KWfA9HY5aFkfus3+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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