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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf16111ee37e52b7af4c1d43dcc7f46d5d627c0c1de74d867355c413fe9ee1d' 
  AND token = 'pvbl5uhg1h70Em559aLMU9B0dtMzr16/BkxbbdaSFk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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