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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f558254ba4fc47e85f0633aa6e193656f9f0cc811419ae699d4f898b84d7bad3' 
  AND token = '2qd0/tloDZne8rJH+eGElKMfhVd3ratVtbBkkHWZSIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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