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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7475053cc1f7992ad97638340ed6a5e9feb387e90356ebf8d8bdc0c39b5a8aff' 
  AND token = 'SnnY74rL4RALGshKT3ltaHY1bF582S2KL4D/vOvSmCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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