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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ce39ecb937f4f274ca57d7dca3406f6d0a2977f4ac6f2c05d7b68cfedc0c1c' 
  AND token = 'lbKr/dBv5fNH+gEmEnD1lTLrnRrZM2cIyNLkdFdxNH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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