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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c167ffe557bd091cfea84e417ede937caca94007b2ddf4e3167d7f40d0b7d8ee' 
  AND token = '6ExN/x+w2O8uQ2R0OhxPo9b3pCo3/kztXkp8ZXEMugQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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