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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba9663c7f18fab183452e091ced9a9bcb3233c1a8411e7a101f4bccceea66ea' 
  AND token = 'sjQwpmjGOeNOWn0GEVPS1+BQ3nJ/lmG0Aax7BWX/kPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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