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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a949d382c66dcc877297dabb531f4bf5930c1cfca91679e829b5d9f9576747' 
  AND token = 'c62ih+kYlVa7JUJ0ZrAQph3SwoblpT8VgDF4nF07p70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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