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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e229590efa34f84b2848a1282804c728f157664126bb18a4c1587242f0ad5f6' 
  AND token = 'i9O2Kdny01lC0uBh1G4Tt0cVeAugI1CI3lGPlPckXQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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