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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c08fe67ed2df726071fffdf813d44c61c7c9a9510747ac2fc311d24321357ce' 
  AND token = '+QMbiyvNFH5i5kxlWCtWAC6D3GGG1RS6CYaNwNAhON4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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