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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffeae3124835e5ca6fc2ab24f9bcea51df05b8aadf1f0b98a0c0447f6225fabc' 
  AND token = '/Oy7q4h8De55PRVVrgnZ3FPtN5m/uiyTiv62FvfG5C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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