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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402cc6b759b33b52aed29115aa16eff46da158914e410aef6248718a3d8e78cb' 
  AND token = '2XlHFOu8xS4kIwV+1E+76WmWtwrfNmeGsfKOTODzFlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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