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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10bef79f6f69daa25e0374fd10dba1de96ddf155f50bb450a8afc1b2f3eae8f' 
  AND token = 'CeBhXhFzh1fVOBnbXaFtOI6GrUAOu8WAVDPIRLcp4nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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