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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3695a02f01555899ee3c9d95dd333b10dfafbca646790ba9f2e80aff2126c6be' 
  AND token = 'dGWpjMh7X3vhyOsAPcxh3Li+6lIOqU4pcgayyzpLpyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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