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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f340eb26100f5016df22003e0ff53f8cd3291082d9563f5096cb751a9b1b55' 
  AND token = 'Cno24Yu9VtnCAiNucVfTSg6TOVdoL/8D1bJWxRv+2fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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