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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae1f6308d90df0c8f4351dc92c407db5f106714773a209fd3fe0a176d3f4ecd' 
  AND token = 'khgKcu2HDCLkRchaQNTabg1I3+rlQge+C3DQ2y7ZH3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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