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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed0b94f43e86ecb0157bd92b9a1158f829e0ccee8495027b9496ad12c0f68b3' 
  AND token = 'fJLDD2I1vrzorK0o0hUbNMtd9SYZ999yaKYE3LbpRn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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