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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6252e2f8edafccbb00bc53934dddc8ec909b921432708793f6bd79aa9f17aee1' 
  AND token = '6w576chdhdBtsBNENvsZ8yb90qC3LX+hNyLIpT8JrKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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