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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f210833de75d01f60acc711083c3c0a0a677b23f05205b9b2dcb5d821652eadc' 
  AND token = 'uHozym+oZCoW+hFR75tVU/jVHes/F1AspOQ78R/mC0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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