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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b67754ccf45aca15594f6c9ae5f0b114acec5855aa6ffbaa26c6fcd2b21a70' 
  AND token = 'Rzjs4rdDGh0pI34EdpJCbmUt9k0/Dq5+cfzH5o7i5BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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