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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9dfbbdf66272b551e3b1f0b9dcc30efe34f42c996f1f20ed93ce0dcfd9298a' 
  AND token = 'i6Vtiy5sEoM6yrsayVip7Bh080Ncnxczft5j/dtNc+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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