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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4ce5feaa89871291eed6df837cacd0f5b95e834b8334e83365fd51c7f47dbf' 
  AND token = 'vL5QL6iT5i7lXv/5fBFA4kiiHb1dwFE/HueN1yDuDrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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