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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990765d5fc9b123f77586a522b8a1117e503ccdf9540e0ab133fa673e88223fa' 
  AND token = 'E7Nq2hbRfEGYDroHvR2ryVXkmsVQQ+I4PmpTlDigC+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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