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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc5f4a2415aeac1126fbc5bf1f08c1aa2c0e4bcce9ff9af0e29d12ba37202a1' 
  AND token = '+qki6uOv7eZCZCXhBcjmTk62GpEdzyFW61+IJqEDIfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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