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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a4ea69c3834bb3dba626f485465ed80a87c53b248347f479b626a01c4807e5' 
  AND token = 'vOhHrg1RzdsBPkg/idRB4s01I71kcXVv16AiA0+OyLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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