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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cda0f807ff32ddbba6481f7c65eb6507220cb297353346cc35900f33c57c01' 
  AND token = 'RjfdvGf/V+pDRUYrnsQhjK1waYb7854Vr2VcFtKkkQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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