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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e804ad9ce51d5dde7bc19b3bd42d095881e554a22a064d158b41a9b0db62d4c7' 
  AND token = 'kKv1d/qynhmkP29/TNiEgoD/hx+Hh7R2OgtiJUbBB1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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