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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cfcd4eb3678645162b33f60bbc8ff7e2f1d00e5c9858f3edab5f6dcabbcae3' 
  AND token = 'FEUkKqEiQb5cpoPxRhNFCRpyDqC6Vqaz4uued4FkQ/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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