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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8317cee9750531ecc935628ca39b3028d73dcbf518f2967d68ae80a2c8d44b67' 
  AND token = 'r/oFWtyzDtHboxT77xRbjTjLEV9gyNYeMeyxRmFv3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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