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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e5e981b66e62f3e02af6d308dad0b8039e747ebe2cc2f39971c0bab946cbaf' 
  AND token = 'DtMsaY5aszDHiYOnsUwDt+d6t3DJ1DvccJp0WvgBB5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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