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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c3f3b52cd855fa6eb236169dab134c05641f724a2ac7ede13cd38b8484aab6' 
  AND token = 'QGzIivtQnDifeBEv52UYvtGZTN2SIbk+uAEGLm0s8fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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