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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb718c22015ed320f221f7fa680de649882a7185fb9d7e7e04f9ce5e482add42' 
  AND token = 'CdXXWFFDDxw0cL3iyr9op+hIl4RwwsGsgdCoDfA9usM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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