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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049cdfba9ade2b15d9ff4bdec6e0989cf5d6f31547fd2e90b08b6466a59fe93d' 
  AND token = 'R/N85mLweTW3nVkNzbRJzOmu+nca+mx77QV1JN/yaJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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