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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69216f3fbbaa22dea2e7f8f06b76120e2fdc2f66ab30892412c06a6b6b702076' 
  AND token = 'PVPuAmRnY04ILDjejpLHEG3y3aK3DVnp/v8GbG5J10E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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