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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f876e491f8162ab6c400b75f25d50b4c5ee98154c1e856b377ffde523004c2a' 
  AND token = 'lcl0sA6O6/B0LTjQK/jXzU2o+muB2fTWLDAFKfyJsH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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