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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da8a95a951b558d56b88dff6b6d77883c439c938a6dde274c0ce04c8aabcde5' 
  AND token = 'bsgka1p3FtlropHU7JAGuCZuVqAma8LhEYynQc7S4+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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