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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbcaeb4773ef6df98a0c2be3ccbd63d75186773c90d498710ed3d4bcafa3e25' 
  AND token = 'iztlhYCkt5erwbMV1fiR7eYzf5xharvc5MSdd3Lc3tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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