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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd045166b89184d85f4ddc4d8a1e9f1cfc422986e06814c4d5cee31a0248ae891' 
  AND token = 'Wfs7S1GVy0ES8YdW1knORMvtbiy0TOGNpLVT9FVv+XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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