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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056ee1b8002aac19c3c70e313eff24423590b729f6e4c84c67ac956bc59f8849' 
  AND token = 'Lgt6cFX1rJqroVKkhEn+NZ6hDmgKDUaZurxYXV1q1x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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