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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7006c00422ec469b2ec6023244d2a483fc97dec7356d206b8f8fe21c3037dbd7' 
  AND token = 'wzmEu10pHiQ2X8oxCud4MJz6C3NhcoJhY367pH0BESY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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