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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097a2baae984654d2ee11e98f12c497432b7d5a67b99c881d6dfeea9b4bf6eaa' 
  AND token = 'iRefRqwHerSHOV8qrMmPt3TpbGCY5XN10qEZ+MrWP68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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