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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a1f34c38638eacc5bfb6ac3ee7b2ab5eef72e4754d1e47a0fcbaa961d4b84f' 
  AND token = '6AXNN3IhmNAcKzLK+e59Ue7qXIIRq5/pLmn39NZNo00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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