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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1536da240b78b340c62f5735fcfddb3ac410dcd92a3ed8b3d53355fa660614e' 
  AND token = 'k2J/17wvak6KO0sXnJnIG1fCpiFS8mf39vqT8hdDPNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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